Only in the latter half of the twentieth century did the star of Jan Dismas Zelenka begin to ascend. Why did this major Bohemian composer of the Baroque era - who was known to, and esteemed by Johann Sebastian Bach - remain in the shadows for so long? Although most of Zelenka's music was composed to serve the Catholic liturgy, he left a handful of secular compositions, including six remarkable chamber sonatas. When these were first published in the 1960s, the resurrection of the almost-forgotten...